Rotary kiln



Oct. 13, 1936., G. F. HoRToN ROTARY KILN filed June 24, 19:55

G'cioerye I.' Hrow,

s@ 1 y @www oct. 13, 1936. G, F HORTQN 2,057,526

ROTARY KILN Filed June 24, 1935 2 Sheets-Sheet 2 ma JWM Patented Oct-13,v 1936 A i r UNITED STATES PATENT oFFicE 2,057,526 I no'rAnY KILN George Frederick Horton, HoustonrTex. Application June 24, 1935, serial Nc. 23,179 s claims. '(ci. 26a-22) h This invention relates to improvements in ro- Ila, respectively shown in Figures 1 and 3, and tary kilns for burning or drying materials of all carried by a suitable support I2. Y kinds, especially those materials that require The stationary hollow shaft 8 projects into i mixing or stirring in a constantheat, and is parthe end 6 of the drum and-forms a conduit for ticularly useful for burning lime from oyster Supplying hOt gases 0r products 0f COmbuSti'On t0 5 shells. the interior of the drum. For this purpose, the The primary object of the present invention is shaft 8 may be connected with the combustion l to provide a Simple and egloienl; rotary kiln by chamber of a suitable furnace to receive the hot means of which a, desired material may be propgases or products of combustion therefrom. The 10 erly and economically burned or dried in batches hot gases 01 plOdllCiSS 0f Combustion are allowed 10 of the desired quantity or Size, to discharge from the opposite end 'I of the drum A more specic object of the present invention through an axial discharge plpe I3 whose inner end is to provide a rotary kiln of the above kind ln is secured to and supported by a. spider I 4 rigidly which the matcriai tc be burned cr dried is submounted in the end lief the drum. The end 1 of iected cc the action cf not gases cr products cf the drum has e relatively large axial 'opening at 15 combustion sowing imc and out cf the kiln; and the apex thereof, and the dls'chareeripe I3 pro-v wherein discharge of the gases or products of jects outwardly through this Opemhg Centrally combustion from the kiln is conveniently conof the lattelf ehd ih spaced feletlofl t0 the Wall trolled for keeping the temperature 'within the of Such opehlhg e5 Shown oleatly 1h Figure 3- Adkiln at a proper and constantA degree so that a Justahly threaded 0h the Droleetlhg Outer ehd 0f 20 superior product results from use of the kiln. pipe '3 1S a closure 115k 5 haVlhg an Operatlhg A further object of the present invention is to hand Wheel '5 and adapted when threaded t0- provide a kiln of the above kind including a, Ward the end 7 0f the drum t0 Close the opening drum having iiieans fi. rotating the same in one in such end as shown by full lines in the several direction to constantly mix or stir the material Views- On the other hand when the closure disk 25 a being burned or dried, and having means for ro I5 is threaded away from the end 'l of the drum, tating the same in an opposite direction and for the Opening in. this end of the drum Wm be automatically discharging the material from the opened to permlt dlsharge of material from the drum when rotated in suchopposite direction. drum' The pipe I3 1S preferably connected with Other objects and features of the invention will a conduit n for conductmg th? hot gases or prod' 30 become apparent from the following description ucts of combpstion fom the kun and discharging when considered in connection with the accomthem at atsulta'ble distant point In Order to pel" panying drawings, in which: mit rotation of the pipe I3 and closure disk I5 Figure 1 is an elevational view, partly broken Wlth the drum the Outer en@ of pipe I3 1s prefer' e away and in sectionbof a rotary kim embodying ably connected with conduit I 'l by means of a 35 the resent invention swivel connection I8. In the conduit I'l is promlurezis atop pian View thereof vided a suitable shut-off valve I9 whereby the a discharge of hot gases or products of combustion oflgguurfeis a' longxtudmal section on une 3 3 from the kiln may be readily controlled to main- 40 Figure 4 is a vertical transverse section on line irt tgature m the kun at a' proper and 40 4-4 of Figure 3; and

The cylindrical body portion 5 of the drum is provided with a suitable opening having a closure 20 provided with suitable means generally indicated at 2| for releasably holding the same se- 45 curely closed. ObviouslyL the closure 20 may be opened for permitting introduction of the material to be burned or dried into the kiln when the a cylindrical body 5 having conical ends 6 and 1. latter is brought to a standstill with the oharg- 5o This drum is mounted to revolve about e holiing opening located at the top as shown in the 50 zontal axis, and for thispurpose, the end 6 is Several views .illrnled 0n a Stationary hollow shaft 8 secured Power operated means is provided for rotating to the upper end of a vertical standard or upright ,the drum in opposite directions, and for this pur- 9, and the end 'l has a concentric external cirpose the drum may have an external ring gear 22 55 cular track I0 resting upon spaced ldlers Il and near the end 6 meshing with a pinion 23 carried 65 Figure 5 is an elevational view showing a modied form of drum which may be employed in lieu of the drum ofthe kiln shown in Figures 1 to 4 inclusive.

Referring more in detail to the drawings, the present kiln includes a rotary dr'um consisting of l e 2l.

by a driven snm u, che snm u being operatively,

tion for mixing or stirring the material therein,

or the drum may be driven in an opposite direction, at will. Means -is provided for vautomatically discharging .the burned or dried material from the kiln when the latter is rotated in such oppor site direction and the closure I5 is opened. Such` mans preferably consists in spiral scooplike blades 28 on the interior of the body portion I and the end I of the drum and terminating at the discharge opening in said end 'l as shown clearly in Figure 3. Obviously, due to thel spiral and scoop-like form of the blades, they will scoop up thematerial andconvey it toward the discharge opening inthe end I when the drum is rotatedvin one direction, and dueto the conical form of the end 1, the blades converge at this endvand provide for travel toward the discharge opening through the action of gravity as well as due to the feeding action of the spiral blades. On the other hand, driving of the drum in the reverse direction will result in merely mixing or stirring the contents of the drum, the blades 28 keepingthe material or contents in the body portion '5 and` end 6 or away'from the discharge opening and the end l in which said discharge opening is provided.

As shown in Figure 5, the drum may be formed in two longitudinal sections consisting of a largey main section29 and a smaller section l3|ldetach- .ably joined or bolted together as at 3l. In such case, the charging opening and its closure will be unnecessary, the section 30 of the drum being removable for charging purposes. With such construction, the driving mechanism may be operatively connected with the drum by providing the latter with a gear 22a at the small end of the end portion 6 of the drum, the shaft 2l being suitably geared and operatively connected with this gear 22a. Otherwise, the construction of the drum shown in Figure5 will correspond to that of the drum shown in the other views and like a time. Also, with the use of thepresent invention, the material to be burned or dried'is readily subjected to a fixed heat for a denite time, the temperature `being controlled by controlling the discharge of hot gasesor products of combustion from the kiln. A particular feature of the invention is that it is not necessary to permit any ame' to enter the drum or to get the heat by using ilre on the outside of the drum, for the reason that, when desirable, the heat may be furnished by hot gases which are generated in a furnace separate from the drum and conducted to the latter. On the other hand, when desirable, asin the case of `drying materials which will not be injured by extensive heat ory by the effect of a direct flame, the heat may be generated within the drum itself by electricity and/or other heat producing means.

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ll'rolnv the foregoing description, lt is believedk thatthe construction and operation, as well as the advantages of the'present invention. will be readily understood and appreciated by those skilled in thek art. Minor changes in the details ofvconstruction illustrated and described are contemplated within the spirit and scope ofthe invention as claimed.

What I claim as new is:

l. A rotary kiln of the character described comprising a drum mounted for rotation about 'a horizontal axis and having` a conical end provided with an axial material discharge opening,

a pipe projecting axially through said conical end of the drum in spaced relation to the wall of said material discharge opening for conducting hot gases and products of combustion from the drum,

a manually openable closure for'said material discharge opening, and a stationary hollow shaft upon which the other end of said drum is Journaled, said last-named shaft being adapted for connectlonwith a` source of hotgases or products of combustion whereby the latter are introduced into said drum.

2. A rotary kiln of the character described comprising a drum mounted for rotation about a horizontal axis and having a conical end provided with anv axial material discharge opening, a discharge pipe` projecting axially through said conical end of the drum in spaced relation to the wall of said material discharge opening for conducting hot gases and products of combustion from the drum, a manually openable closure for said material discharge opening, and a stationary hollow shaft upon which the other end of said drum ls journaled, said last-named shaft being adapted for connection with a source of hot gases or products of combustion whereby the latter are introduced into said drum, said closure `f being threaded on said discharge pipe.

3. A rotary kiln of the character described comprising a drum mounted, for rotation about a horizontal axis and having a conical end provided with an axial material discharge opening, a pipe projecting axially through said conical end of the drum in spaced relation to the wall of said material discharge opening for conducting hot gases and products of combustion from the drum, a manually openable closure for said material discharge opening, a stationary hollow shaft upon which the other end of said drum is journaled,

said last-named shaft being adapted for connection with a source of hot gases or products of combustion whereby the `latter are introduced into said drum, means for driving said drum in opposite directions, and spiral scoop-like blades on the interior of said drum for automatically discharging the material from the -drum when the latter is rotated in one direction and the closure is opened.

4. A rotary kiln of the character described comprising a drum mounted for rotation about a horizontal axis and having a conical end provided with an axial material discharge opening, .a pipe projecting axially through said conical end of the drum in spaced relation to the wall of 'said material discharge opening for conducting hot gases and products of combustion from the drum. a manually openable closure for said material discharge opening, a stationary hollow shaft upon which the other end of said drum is Journaled, said last-named shaft being adapted for connection with a source `of hot gases or productsr of combustion whereby the vlatter are introduced into said drum, and means for manually controlling the discharge of hot gases or products of combustion from said drum.

5.1A rotary kiln of the character described comprising a drum mounted for rotation about a horizontal axis and having a conical end provided with an axial material discharge opening, a-discharge pipe projecting axially through said conical end of the drum in spaced relation to the wall of said material discharge 'opening for conductingl hot gases and products of combustion from the drum, a manually openable closure for said material discharge opening, a stationary hollow shaft upon which the other end of said drum is journaled, said last-named shaft being adapted for connection with a source of hot gases or products of combustion whereby the latter are introduced into said drum, means for manually controlling the discharge of hot gases `or products of combustion from vsaid drum, said last-named means comprising a conduit connected to said discharge pipe, and a shut-off valve in said conduit.

6. A rotary kiln of the character described comprising a drum mounted for rotation about a horizontal axis and having a conical end pro- 'drum is journaled, said last-named shaft being ladapted for connection with a source of hot gases or products of combustion whereby the latter are introduced into said drum, means for manually controlling the discharge of hot gases or products of combustion from said drum. said last-named means comprising a conduit connected to said discharge pipe. a shut-oil valve in said conduit, said discharge pipe and said closure being arranged to rotate with the drum, and a swivel connection between said conduit and said discharge pipe.

GEORGE FREDERICK HORTON. 

